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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'ab761dc927b8648ac0b59b91ee8d80b8db517aa6582291e014e0ede4121459a3' 
  AND token = 'aNRNu+LSvzMu7fEEpdY6qkhtSXDAxN/xA5mgYxHN0aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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