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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd868d19ca10158f61a976368be9b818d997d4486e8c7cbb86e9cd8971707cea7' 
  AND token = '1iTXTBRTihvuep/Jd/UGFFG0YDR2ZG1pD3aa6ZOjk38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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