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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b2ad712a3e36f4ee2cce8ca66a1b6dd34829140656255b2f89b93566589455f' 
  AND token = 'Eqz4dPDKIULunN4iWeSeeZB1KTrxfiVr3HlL0jhMCrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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