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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'a87d55d5c171eb895d815a060bfb05cbc9f45877a58ebf9f549cf8bfbddd4768' 
  AND token = '/LQ4Rnfz0vN314MCJNlxQm8Yg0MJCTh8bR4RNrQffjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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