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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30d8409596a269360b84ca207a02bb432267aa103e512d41c2d4e5321ed9e69c' 
  AND token = 'mij6vPE1qL7S3iKlmicEhNY79g2kWPsg/AvLs6a/eZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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