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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf86efc8f549b576152f6d43a944bf606bbc8ca50cbcb7f298fc09fd6b640211' 
  AND token = '8CSRWtZLvN/mT3IWPXuWaKm5rEKnqf8gcQafBIh1vxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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