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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e84b3d276563aeee1a8ea86d0745826c5d1147c1eaef46d6c350b78a3d180db' 
  AND token = 'vNBLTJeTbCoE5j4YXjCEk/11AMBCS5i90C2s/+e4pdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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