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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3bce6fea99058e690acc627f45ea8b21c132056c6fe89cd0786be0cb2a1f949' 
  AND token = 'PjWCiJGaNsfRL9+o70lXX91N+BxZdCG6enoGli2QlmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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