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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '3c97e9e004c0f055b3da0d1a41d1f57bb4a8dec713956e4098ae17579bc987b7' 
  AND token = 'c0EEXVlSa5ACflOAeV0WylIOZEa8Zwa9V0CjRaoV0rY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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