Sandbox

SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'e19829755b847cd1cbea3408241484829619d877899562eadb3e4a48314bb966' 
  AND token = 'ZMva1HL89bx7nw5HLh03gZ0SEUIqAufTQRX1ClfyW9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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