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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ef9ac8aad335a6d4ecd4fbe9bd8b811fceb4d0936cf9637e686bc4d30ecea9c' 
  AND token = 'Nccxmypo7gBGG5OWtVok4IpPYJR08hb9iivDk/lY36c=' 
  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"
    }
  }
}