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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '6b8367443554ec2b0d88233db11a07531935efa834b0588fb8cf4d9ebdd2ef3a' 
  AND token = 'jarTqyuQD0lmrokLjaKM4qQ6TRSgtrR4dIfe7ca96Mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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