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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b443fd01517b52801a91af84d8c991434873a0540d945ba656c4466d93c03997' 
  AND token = '55smZXcEr1AwO6irHA27fo60bDJF9DXdTsa/awA6zWs=' 
  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"
    }
  }
}