SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '2921916e15bb0a43a483c750d986fdca19c5d43b944e3b7684fbb2e168c49589' 
  AND token = 'Jrk/jOlj/VvwmIRWgWx0LjsnVGDrpA/uVFxU1o+h0Ag=' 
  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"
    }
  }
}