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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '6c52b973af19c4fb4349c149935d14f7c7f311bbdb5a1753132d439a4f4c3efc' 
  AND token = 'F+JH8Wdd0ZCgM6Hr96SBSJUXNgoWj5hGxTe5pWjEDMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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