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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0c52b99666826bd18bebd5600f4c30bdfa9bd55603be8cdf0aa2c35e41bf399' 
  AND token = 'daLVU5L789ve0dqzcUhgz8yoExCkoS2xkITPHccuifI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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