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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8c146a781e21f644f1265fb0c692cfc0d3b48f8a1494a45f6eb166f64cc7e04' 
  AND token = '2AtftPadVQIf9dVQ4LlE28XrbPYXah9Up8ne9SiexlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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