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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0235e489a74e41b1f99cc5e87751032b6cfa5604a3504b7d6904a9d55ee35314' 
  AND token = 'y3ScnqvYI/IpyCSFU8lcxzTEGvZXU3LpF8wD0eFsXlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}