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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3e16dd6c24a125b925bb19d8c1c56b8e99ec4e89e6793903f028598db552d5d' 
  AND token = 'K0Dl8bp9T7N8Gsu99wxOmU3YwgUJsNFoCc1aotaKrVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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