Sandbox

SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '52ba4ecff967fa1160ba46e2556416e6400b0dfd72674a8a3190ee65d3dd073e' 
  AND token = '/a1woMRj149GM+lBRM4mfkxWCFgW8Sid21TpoGLL7KM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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