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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b12d825fe6508f91442db340f89cbc82191799f55e33c9f92849264b9ed2069a' 
  AND token = 'FA6pLPPbSN5R25pw4HxvHC0+L4JkQQDJt+qlqn+qRSE=' 
  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"
    }
  }
}