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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '3f9d86b5b4f81a0ba93a3c522844e5d6dece9451e42d0316b969abc0c3480586' 
  AND token = 'Jos3lrEgESnr8QS/q1BOpVnKu5/dzU3tPgl0V1y9XeE=' 
  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"
    }
  }
}