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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b035bf3a14d4fa75c14062a82fadc00577488e41b6f005fa1bfb6b38d7d01384' 
  AND token = 'HiP9bF4DWHGHmZpm/X5dgUVBCnxDCtu45EZYNsJfMM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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