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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20083b3895faa68393dbf7e30a2cc95bc6a9b00e149053d8316d26124a9e3269' 
  AND token = 'x2z+rfl1Vh9RnwSbPpBAtvz/3ayF5gzE3aQK2CKoydc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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