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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c12cfc782a21557323847dc8386ae37e232c12dcbbc267a0ef61e9d6ee490c9' 
  AND token = 'hUim0WXTFD3CldW+iTmOSeYJ0KT37yq6QA+iRyT2aIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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