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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2701424e74e0ca24413e34592b8874343ed7ef0e1ea9053778d59d4fe7dcfd7a' 
  AND token = 'NQzzlKNSslShMVCyOx6wjd/1Jf42kZGbULsHUghWfZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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