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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96ee176287bc232f3704d171bc0fd398eca8fd0d821d87e81317c0298dd644e6' 
  AND token = 'kI0+D9xM9w0C4cCKsU8P7/eE8qKfalBDBcC0XKClUGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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