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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a47fe3e94b8e10ffb60647fca6b229455fbec704c1d4d91fe020776829a800c' 
  AND token = 'C1Y5Zza/Br0M3vB7nP59dgTc7ucDFJigMZWul1SYRqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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