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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '28b8aab577a8c25d5d63e79e9d75da6b6550c36df8c692b37a92f1b3e1add9a2' 
  AND token = 'JAVzJOEd+heGo1sQNVfkCDvqBrBJYeXNfQBx5AhWXag=' 
  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"
    }
  }
}