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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'dadac9a6bf23bca44fd5cd0fbbd13bc53ed62f83d7c39dff64dcaee7c5df1f90' 
  AND token = 'm/h90ba+uWrZ+/MpBW3THQyAyJzXzTyJrzYEMORZjG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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