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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0afe2265d935608a15c073149b1999db032c56ed31c3e3fa88f45f27120ef1bd' 
  AND token = 'B4bE6VKOKIkRhfE/LtNt56QuLrsaDeJseB7G31tdeSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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