Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbe6fcd620e5b59cda901870d53fbca0ba352420b07e6d5f1fc98799baee3941' 
  AND token = 'K1uXwbfwVA11UFSLdUal/F7VwvHyVYA7du+CK462exE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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