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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebed9cd7c4f1614f6f8cf4c27b2f4ce35b4cc86b0cda02df3dbc0509ed28ca08' 
  AND token = 'kV0Pw0sUjmHDKnSq1lX8vYECdPBumf2NFmpLEYENxdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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