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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1498e9fe3e2be5df82fcfbc3177291754e16b397856c4aa444d92484d0ad739a' 
  AND token = '8iDejnT3zA1BmttRX+8q96EIpGzDkqoLI2kIPnQyUug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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