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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eba304957eeb501edd7297837a0094e9c9735f3bbd21a77887a4547d4354868' 
  AND token = 'lCkSiTy5r27WnHml2Yg6+TSSQu8W+Ix+gFIg5E3qQxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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