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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f88600ec7dd3bf4606bccdb0d87c01adb3c5ae42397e0616d0a3b3707a8b4539' 
  AND token = '9q4t7F3tm7Qc6BJ9du8zE+CgkTP811xeUI8sKD9GzmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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