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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8593e73eb0d4ec91f78a19b0bdae41a3ef9c56a4278fb325ff5e0e9a47156dc' 
  AND token = 'atB5UZpA1GOZ8SIQZWYM6cYtcWK4DYZLd08HzNk9QyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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