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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00a353104b89f3d87b29a7589f8be81670077394b3f4ea3bcadc6187e90cc7a4' 
  AND token = '+G3cLCajSqbUpG4WDs72OlwVi6g7hXjHyiqxVnl3bVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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