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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba0c76e07790ad4fec618fa29ac9db5b96f72957bda9e4b6374d2f02490c4ec9' 
  AND token = '3994G6sbmISOF7SZnGMqTBS1ZpCX/Z7b3NBjP7ZGVyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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