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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '122d50583434d47b8f43e54d9e326587ce2dc9bc122ce048b8c646ff3830ee58' 
  AND token = 'jym8qY+869HjONDC5HS1OaMdO+UGN09RRKpYzz5q2/4=' 
  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"
    }
  }
}