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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '7ef7dbe8a07d28993835f6a638792acdcd6f62b496dcc275910f217ea24bb5bd' 
  AND token = 'FHTHS6vx+bbWoxSJoK7D22fj4uIeN4eTQG3hAfd3qe0=' 
  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"
    }
  }
}