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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6990de66977e45cb6270f0ab39215066620f5b9d11e2725df5c697dea32ac15' 
  AND token = 'GILZ3VKPK29Olm/jRWwlVfo6kxs4pQYXlInotWf2HKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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