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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecc9b50af3fd2f8394e90712b85e6119a824e1fb691a660f935c8f02327147a3' 
  AND token = 'fCz5Fo8hmDwfpn7eiEAkAamZaG0d2MXaOR9amdT5oJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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