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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7af774d1517bdcb0189972c0014e33ab769bf117b728c1f8b99a91eba661b593' 
  AND token = '8SVRO8bE8J2D9X55/BSBbP/uTXHQukDdzfmaZnq+2Tw=' 
  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"
    }
  }
}