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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36290478b6258e5c68f9db9e2cb6675b9e7cc0b16a921d9d575ba21cec18fd0b' 
  AND token = 'FO9qVOHgjkuIo2DEccxe49shdVXoj331yHbjNyAYZrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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