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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1068a4d5de36c79d9f510773bf43557973a6a0f84eacf9a3ed43390ff2db790f' 
  AND token = '15UeetS4W0R2E9d5z0fzHUGlkOxnazsJNRaFP+44JTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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