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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '6c87ac1ac9c094ee85ea58cb37c06600f15064322faaf9debfa64670c65fbf8b' 
  AND token = 'VCUdAaQjmtRSfHX6WYyRMC4c8OUuluoaYobofa+Gf+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00007

JSON explain

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