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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0f8ce0546aea321468994377ab0182332f0aa38e3bfc05f79851c07a153df84' 
  AND token = '0EOzOy9Wzwz7ar8a2HffgX7PBL8lcG9eH1jJcoddNgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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