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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'a406d37350c731dd65c6c93b28fcf20c9dd170b929530fc4243c76348adb5fb3' 
  AND token = '42MLpFqa2FtdvDh0A7p/kAUpLLlSNFGWdGPfMIOZvkA=' 
  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"
    }
  }
}