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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '093c8f1ee7f42b186bf56b05533cc630774f74cd919b66f90911b6f820689cd4' 
  AND token = '1JeJXoF/qyR+R76bQnzH7BIVtfCDeM/LtQBtzI3metU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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