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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '530fe55d647dbed5b5fe2da33eda6abe27c6fc43b6a9787a1ed5d980fd4d9cd2' 
  AND token = 'OconXKQxU2zY6CYU0m4gL3B2dFSrlbZA8Q7ZKpO+Suw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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