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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a4118802a0f67c6151d190985067ebe5043b1f38b7493b683b6b077622c7b34' 
  AND token = 'mvEuXvWksADusNIR1K05yo994RtfpmTlC5Wwe9Cowio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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