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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '4d6f6f7e09e79f0906df50ea381ea5e92d249e0a8d7a58f2a5a11e621800e095' 
  AND token = 'WBiQum7EJ+x4sz5vWRm3PHKi0jFzbXwEpfuie9tOHm0=' 
  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"
    }
  }
}