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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f494322ee931c2a7cbf760bf2b74509190427a2bb8812ed33e028a8d6ba6235' 
  AND token = 'Iuy8ovqx3UbkqQYGutBK5lmma7IBra+S3hlwWrzSU5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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